Observing a solar eclipse on January 1, 1907, in the Tian-Shan mountains, probably in modern-day Uzbekistan. This is a photograph taken by Sergey Prokudin-Gorsky, a chemist and photographer who invented a new process for color photography and used it to document the Russian empire in the time period 1905-1915. You can view many of the photos on Flickr or at the Library of Congress.